In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
Manyastudent _____thatmistakebefore.
My mother is always warning me when I go out, “Don’t get off the bus ____ it is stopping.”
—Johnson, there’re a lot of chairs over there. Go and fetch ________ for me. —Why ________ ? Mike is sitting there doing nothing.
---What is the terrible noise ? ----The neighbours________their kitchen.
—Why didn’t you put your cellphone in your overcoat pocket? —I ________, but I was afraid it would be stolen.